It appears we have regressed even further after webidl landed in bug 850430: 151324:9ba162545a93 (just before webidl landed): - 3836ms, 3857ms, 3830ms 151331:6838df0041b3 (just after webidl landed) + workaround patch in bug 929652: - 4099ms, 4099ms, 4089ms 151341:07db468de86e (after bug 927079 landed) + workaround patch in bug 929652: - 4050ms, 4065ms, 4054ms Keep in mind that in bug 927079, after fixing the regression due to es6 for-of, we were seeing ~3650ms times. That means we are really at around a 400ms regression here.

Profile of b2g and contacts bench app: http://people.mozilla.org/~bgirard/cleopatra/#report=608af1bc50154b23b1f27ebf20e25c12dc395aae

Ben, do you know if this changed since then?

I have not retested, so I don't know. See bug 888666 for contacts bench app I used.

https://bugzilla.mozilla.org/show_bug.cgi?id=1472046 Move all DOM bugs that haven't been updated in more than 3 years and has no one currently assigned to P5. If you have questions, please contact :mdaly.

DOM: Contacts isn't used anymore. Closing all remaining bugs.